Simultaneous heterotrophic nitrification and aerobic denitrification by bacterium Rhodococcus sp. CPZ24

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• 作者：Peizhen Chen^a ; Ji Li^a ; Qing X. Li^b ; Yingchun Wang^c ; Shaopeng Li^d ; Tianzhi Ren^c ; Ligang Wang^c ; ^{wlg@caas.net.cn}
• 关键词：Heterotrophic nitrification ; Aerobic denitrification ; Rhodococuus sp.
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：July, 2012
• 卷：116
• 期：Complete
• 页码：266-270
• 文件大小：613 K

摘要

Rhodococcus sp. CPZ24 was isolated from swine wastewater and identified. Batch (0.25 L flask) experiments of nitrogen removal under aerobic growth conditions showed complete removal of 50 mg L^鈭? ammonium nitrogen within 20 h, while nitrate nitrogen removal reached 67%. A bioreactor (50 L) was used to further assess the heterotrophic nitrification and aerobic denitrification abilities of Rhodococcus sp. CPZ24. The results showed that 85%of the ammonium nitrogen (100 mg L^鈭?) was transformed to nitrification products (-N and -N) (13%), intracellular nitrogen (24%), and gaseous denitrification products (48%) within 25 h. The ammonium nitrogen removal rate was 3.4 mg L^鈭? h^鈭?. The results indicate that the strain CPZ24 carries out simultaneous nitrification and denitrification, demonstrating a potential use of the strain for wastewater treatment.